1. Turn your Toshiba M-55 laptop over.
2. Find the laptop battery release button lock for your Toshiba M-55 laptop.
3. Now that your Toshiba M-55 laptop battery is unlocked, find the battery release button down.
4. Holding the laptop battery release button, gently pull your battery away from the laptop.
5. Now that your Toshiba M-55 battery is removed, grab your replacement Toshiba M-55 battery for installation.
6. Insert the battery into the slot. Push the Toshiba M-55 battery towards the laptop and secure it in place.